D.C. area forecast: Too hot through tomorrow, then refreshingly cooler into weekend

Today’s Daily Digit

A somewhat subjective rating of the days weather, on a scale of 1 to 10.

3
Thanks, but no thanks, Mother Nature. We were doing just fine without having to worry about the heat index hitting triple digits.

Express Forecast

Today: Partly to mostly sunny, hot, humid. 20-30% chance of p.m. storm. Highs: Low-to-mid 90s.

Tonight: Muggy. 20-30% chance of evening storm. Lows: Near 70 to mid-70s.

Tomorrow: Partly sunny. 40% chance of p.m. storms. Highs: Near 90 to low 90s.

FORECAST IN DETAIL

When you walk out into the sizzling heat today, just try to remember how gentle this summer has generally been compared to the previous few. Sure, it does feel late for this kind of heat, but it’s really not that unusual for early-to-mid September. In fact, we’ll likely fall short of today’s record highs of 98 at National, 99 at Dulles, and 100 at BWI. We’ve got one more rather warm one tomorrow before temperatures tumble nicely into the weekend.

Temperature Map

Temperatures: Latest D.C. area temperature map. See interactive map on our Weather Wall.

Today (Wednesday): Yes it’s September, but you’ll be well served today to heed the usual August advice of staying hydrated and avoiding strenuous activity outdoors. With partly to mostly sunny skies and moderate to high humidity in place, morning temperatures quickly climb into the 80s before topping out in the low-to-mid 90s for afternoon highs. Winds are light, around 5-10 mph from the south/southwest, and the chance of a late afternoon or evening thunderstorm looks to be about 20-30%. Confidence: Medium-High

Tonight: Still a 20-30% chance of an evening thunderstorm. Otherwise, we’re looking at a partly cloudy and muggy night with lows near 70 to mid-70s (suburbs to city). Confidence: Medium-High

For related traffic news, check out Dr. Gridlock. Keep reading for the forecast through the weekend…

Tomorrow (Thursday): One more hot day to deal with as highs head for near 90 to the low 90s, this time with partly sunny skies and humidity perhaps a tad lower, in the moderate range. Breezes remain light, right around 10 mph from the southwest, and the chance of late afternoon showers and storms is up a bit to around 40%. Confidence: Medium

Tomorrow night: We hang on to a 40% chance showers and storms through evening as a cold front moves across the area. Once the front passes overnight, winds turn to come from the northwest and begin to bring in drier air. Skies should be partly to mostly cloudy for the balance of the night with lows in the 60s. Confidence: Medium

A LOOK AHEAD

Friday has a distinctly different feel with mostly sunny skies, much drier air filtering in, winds from the northwest gusting to near or over 30 mph, and highs in the mid-to-upper 70s. Winds may stay breezy enough Friday night to keep temperatures from totally tanking, but it’s still much cooler with lows near 50 to the mid-50s. Confidence: Medium-High

Winds ease up for Saturday, but they’ve already done their work to bring in substantially cooler and drier air, as highs probably only manage near 70 to the low 70s despite partly to mostly sunny skies. With light winds and mostly clear skies, temperatures really bottom out Saturday night as lows dip to the upper 40s in the coolest suburbs to the mid-50s downtown. Sunday should still see plenty of sun with somewhat warmer highs in the mid-to-upper 70s. Confidence: Medium-High

Also on Capital Weather Gang

PM Update: Wednesday likely to be hottest day since mid-July